Spill (one's) guts to (someone) American Verb + object/complement informal UK slang
To share everything one knows or all of one's personal issues.
What makes some people want to spill their guts on national television?
Since we were soul mates, we have spilled our guts.
The last time I spilled my guts to her was 2 years ago. We had a big quarrel about vacation plans.
Used to tell someone to keep secret what you're about to say
To be secretly working together
Kept in secret
The verb "spill" should be conjugated according to its tense.
The idiom dates from the early 20th century.